Telephone-exchange system.



C. L GOODHUM.

TELEPHONE XCHANGE SYSTEM* PPUCATION FILED 1\N20| 1916.

Patented Oct. 30,1%?.

van

Y C. L. GOODRUM.

TELEPHONE XCHANGE SYSTEM. APPLICATION mili mazo. was.

Patented Oat.r 30, 1917,

C. L. GOODRUM.

TELEPHONE EXCHANGE SYSTEM, APPLlcAnoN FILED Immo. 191s,

LQMAS., Panama om, 30, 19W.

3 SHEETS-SHEET 3.

i nrare ra CHARLES L. GOODRUM, OF NEW YORK, N. Y., ASSIGNOR T0 WESTERN ELECTRIC rCOM- PANY, INCORPORATED, OENEW' YORK, N. Y., A CORPORATION OF NEW YORK.

TELEPHONE-EXCHAN GE SYSTEM;

specification of Letters Patent.

Patented oet.' so, ieri.

Application led January 20,1916.' SerialNo. 73,217.

To all fw/wme't may concern Be it known that I, CHARLES L. GOODRUM,

acitizenoi the United States, residingat New V'Yorlr, in the county of New York and State oi'- N ew York, have invented certain new and useful Improvements in, Telephone,- Exchange Systems, of which'the following is a full, clear, concise, and exact description.

rlhis invention relates to telephone eX- change systems, wherein a callingline is automatically associated with an idle operator upon the removal of the receiver yat the substation thereof.

@neef itsobjectsis tol provide a circuit arrangement, wherein during` light load hours, as "for example during the night, all incoming calls, maybe concentrated upon a particular position, Vaudit the connecting circuits of such position apportioned .to a particular kline` group become busy, toautomatically bring about a circuit change which will resultV insi'urther calls varriving at positions on either; sideoi such night position, so that the night operator can reach over into such-positions and .answer such, calls Without arising,` -from kher seat.

Another object isto provide a circuiti ar-` rangement wherein, when an automatic iinderaswitoh' istaken for use by a :calling linethe,position to which such iinderbelongs will' become artificially busy ysuntil the operator 'has t performed some act incident tothe answeringoi rthe, `callas for example, depressing her listeningfkey when the idle connecting circuits voi such position areV againraccessible to calling lines.

Referring, to 4the drawings, Figures 1,` 2 and illustratean, embodiment of this invention; Fig.` 2 shouldbeiplaced below Fig. 1, andrF ig. 3 to the right of. Fig.l 2.

rlhe lines maybe divided into groups of, say `10U-lines each, which terminate 1n mul tiples2, 2:5 and ,2651'11 a number oi' automatic finder switches, dependentfon the traiic. In

an oliice of 1000 lines,each, such group would be nniltipled-tof say ten, finders.,- There would: thus 4be-100 finders.l These finders would be distributed `arnongsay live operators positions,-each positionhavingtwo finders rfrom each group ,013100 lines,l Each of these groupsot 100 lines would be divided into subgroups oisay ten lines each` The automatic finder switchesmay be ot the typezshown; in my application, .Serial No.

telephone exchange systems.v Each sub# group of lines, asshown in such patent, has a iinderqapportioned;thereto; that is to say, oneofwthe .setsoi' brushes 18, 19y and 20 on theshaft 17, is, if such Ender is idle, in operative relation to multiples 2&1, 25, 26 offsuch subgroup- In case such nderis busy,"hotwever, the rbrushzishaft'lof the next. idle finder, containingmultiplesof the group containingV vsuch subgroup and pre; selected by a starterwire, is given a rotary movementsby -the magnet 28, until the brush 21, ,engages the groundedv multiple segment 16g-individual to lthe calling: subgroup on the switch G associated with such'iinder, at which time'aset of brushes,18,r19, 20 on the `shaft 17, is in operative relation to multiplesp2i,.25, 26 of the calling line subgroup, whereupon the :brush shaft is given a vertical movement yby the magneti23'tozthe terminals..-24,25, 26 of the callingline.

101and12 designate. respectively the line andV cutoff relays of substation A., Vand V andl the line and cut-ofi relays of another line inthe samefsubgroup. 20() designates a starting, relay which. is common tothe subgroup to which substation Abelongs. Relays 201, 205 rand 202-are alsocommon to thelines of this subgroup, and .theirfunoA tions will'appearirom a detailed descrip@ tion of the operation of thesystem. Relays- 270,\246250, 247- and 271 arefrelays correspendingv to relay 200 of other subgroups. The finder is-controlled by a side switch, the esoapenient magnet of whichis shown at 22. These switches are well known in theart. Arms 1, 2, 3 (Fig. 1) and 3` (Fig. 2)4 belong to the side switch of thegiinder,` shown in Fig, v1. The remaining side switch arms shown in Fig.= 2 belong` to the side` switchesof the finders apportioned to the subgroups under the common relaysof which they lare shown. f

lt is-believed that the invention will be more readily understood from a detailed devscription of ,the` operationsv involved in establishing.V a connection.

Up onthe removal ofX theA receiver by theoalling; party at substation A, line relay 10 is energized; in attracting its armature, it closesthe followinglocking` circuit for it` solil and. relay200, commonl to this subgroup. Free pole' of battery, left winding of! relay 10, left armature and back contact oi', relay-12 conductor 13, left armature4 oiy relay 10, spring 14, conductor 15, left arma-- ture and back contact of slow relay 201, re lay 200 to ground. Relay 200 loclrs itself to conductor 215, independent of the left armature and back contact of relay 201. Relay 200 at its right armature and front contact, grounds multiples 10 of the calling line subgroup.

Assuming' the finder shown in Fig. 1 normally apportioned to this subgroup toV be idle, the brush 21 on the switch Gr thereof will be in engagement with contact 16 of this subgroup, and a set of brushes 18, 19 and 20 will be in operative relation to multiples 2d, 25, 26 of the subgroup containing substation A. Under this assumption, the attraction of the right armature of relay 200 closes the following circuit to move the side switch magnet 22 into position 2, to close the circuit of stepping magnet 23 to elevate brushes 18, 19 and 20 over the terminals 24, 25 and 26 of the calling line subgroup: free pole of battery, armature and back Contact of release magnet 27, magnets 28, 22, arm 1 and its first contact, conductor 65, brush 21, contact 16, conductors 28', 228, right armature and front contact of relay 200 to ground. The side switch escapement magnet 22 only,is energized by the closure of this circuit, the stepping magnet 28 Aremaining inert. Magnet 22 is constructed and arranged to move the side switch fromk position 1 to position 2, upon its energization. Relay 200, in attracting its right armature, closed the following circuit for a slow relay 202: free pole of battery, relay 202, conductor 203, right armature and front Contact of relay 200 to ground. i Consequently, when arm 1 of the side switch moves into position 2, the circuit for escapement magnet 22 is maintained energized over the following circuit: free pole of battery, armature and back contact of magnet 27, magnets 28, 22, arm 1 and its second contact, conductor 30, conductor 206, right armature and back contact of relay 205, conductor 212, relay 201, conductor 204, left armature and front contact of relay 202, conductor 203, right armature and front contact of relay 200 to ground. ArmV 3 o-f the side switch, in moving into position 2, closes the following circuit for the stepping magnet 23 to elevate brushes 18, 19, 20 over terminals 24, 25, 26 in search of the calling line: free pole of battery, armature and back contact of magnet 27, magnet 23, arm 3 and its second contact, conductor 29, armature and back contact of magnet 23,

conductor 54, armature and front Contact of magnet 22, conductors 30, 206, armature and back contact of relay V205, slow relay 201, conductor 204, left armature and front contact of relay 202, conductor 203, to ground at theV right armature and front contact of relay 200. The magnet 23 makes and breaks its intense own circuit, thus stepping brushes 18, 19, 20 over the multiples 2e, 25, 26 of the calling line subgroup in the well-known manner. Relay 201 is slow-acting, and consequently its left armature maintains open the circuit of release magnet 27 until it is opened at another point by the attraction of the left armature of answering supervisory relay 32 when the calling line is found.

Arm 2 in position 2, connects ground to test brush 20 by way of conductor 30. As the brush 20 wipes over the test multiples 2G, the relays 12 are energized in succession. Then the cut-otf relay of the calling line is energized, in attracting its left armature it opens the locking circuit of relay 10, which circuit includes relay 200. Relay 200, inretracting its right armature, removes ground from conductor 30 in the circuit of stepping magnet 23, thus stopping the finder, and also denergizes magnet 22 and relay 202. Relay 10 in closing contacts 14C and 66, restores the control of starter rWire 15 to the remaining lines of the subgroup to which substation A belongs. Magnet 22 is constructed and arranged to move the side switch from position 2 to position 3, upon its denergization. ln position 3, arm 2 connects ground to the cut-off relay 12, to maintain ,such cut-olf relay energized until the connection isdisestablished. Arm 3 in po-V sition 3, extends the starter wire to the next idle iinder having multiples of this line group. Answering supervisory relay 32 is now energized over the following circuit: free pole of battery, left winding of relay 32, conductors 33 and 34, brush 19, terminal 25, line conductor a, through the telephonie apparatus at substation A, line conductor Z), terminal 2d, brush 18, conductors 35, 36, right winding of relay 32 to ground. Relay 32, by attracting its Vright armature, interposes a breakin the circuit of answering supervisory lamp 37, and by Vattracting its left armature, interposes aV break in the cirtor il0, `left armatureand front contact of relay 32, conductor 411, lamp 38, contacts d2, 43 of listening key LK, conductors 414, 207, 300, 301, relay 318, free pole of battery. The operator now jdepresses her listening key LK, and ascertains the number-of the wanted subscriber. Contacts d2, 43 in opening, extinguish lamp 38. She then, by means of the plug l), tests the called line in the well-known manner, and if idle, inserts plug P in the jack J thereof. The engagement of the sleeve of the plug P with the sleeve of thejacl; J, energizes cut-off relay t6 of the called line and relay 39. Relay 39, in attracting its armature, lights calling supervisoryV lamp L17.l The operator now actuates tery, armature and back contact of magnet 27 conductor 56, magnet 28, side switcli escapement magnet 22, side switch arm 1 and its tirst contact, conductor 65, brush 21, contact 16, conductors 28, 228, to ground at the right armature and front contact of relay 200. Escapement magnet 22 by moving theside syyitclrinto position 2, opens tlie stepping circuit traced. ln position 2, the following circuit is closed to maintain magnets 22, 28 energized: pole of battery, armature and back contact of magnet 27, conductor 56, magnets 28, 22, arm 1 and its second contact, conductor 30, conductor 226 to ground at the rglit arma re and iront contact of relay 200 over tlie circuit previously traced.

1n position 2 tbe stepping magnet 23 is energized over the following circuit; ree poleof battery, armature and baclr Contact of magnet 27 magnet 23, arm 3 and its second Contact, conductor 29, armature and back contact or' magnet 23, conductor l, armature and iront contact cit escanement magnet 22, conductor 30, conductor 226 to ground at tlie right armature and trent contact of relay 200, over the circuit previously traced. rllie stepping magnet 23 makes and breaks its own circuitI tlius causing the set of brushes 18, 19, 2O so positioned to Wipe over tbe multiples 24, 25, 23 ot the calling line subgroup. Vflien the test brusli 20 reaches the test terminal 23 or tbe calling line, the cut-olie relay 12 thereof is energized, and by attracting its lett armature, opens the locking circuit for relay 200 Wliicli in turn, by retreating its right armature, releases relay and removes groundV from tbe conductor 226, thus opening the Ycircuit or" magnets 23, 22 and 28. The escanement magnet 22 indenergizing, allows tlie side switch to move to position 3, in Wliicli position arm 2 grounds tbe test brusli 20 to bold the cnt-oit relay 12 energized until tlie disestablisbment of the connection. From this point on, the operations are tbe same as previously described,` tbe lamp 38 lighting upon tbe energi'zation or relay 32 of suoli cord circuit, to indicate the arrival of tbe call at position 1.

Assume nonT that during tbe establishment of the connection just traced, a. call is initiated in a subgroup of lines normally served yby the operator at position No. 2 to which subgroup relay 250 is common. Relay 250 is energized, and by attracting its right-armature, closes the following cir-V cuit to start a nder at the position of operator No. 1: ground, right armature and front-contact of relay 250, conductor 227 relay 216, tree pole of battery. Relay 213, by attracting its lett armature, entends this ground to conductor 228, relay 217, riglit armature and front contact of relay 211, (now energized) conductorsy 219, 220, left intense armature and back contact of relay 221, conductor 222, relay 223, conductor 224, riglit armature and back contact of relay 225, conductor 226, conductor 30, conductor 53, armature and baclr contact of magnet 28, conductor armature and baclr contact of magnet 23, conductor 29, arm 3 of tbe Side switch 'and its third contact, conductor 58, conductor 229, lett armature and back 'contact or" relay 230, conductor 231, relay 232, conductor 230, armatore and iront Contact oi relay 313 (now energized),conductor 233, lett armature and baclr contact of relay 234-, conductor relay 236, conductor 237, armature and front contact of relay 210 (new energized), conductor 238, conductor 239, left armature and back contact of relay 2&0, conductor 2111, relay 2412, conductor 2&3, armature and bacl: contact ot relay 24A: (new inert), conductor 225, conductors 30 and 53 of the inder normally serving the subgroup to yyliicli relay belongs, armature and baci; contact of magnet 28 tliereot, conductor 511, armature and back contact of magnet 23, conductor 29, arm 3 and its first contact, conductor 55, lmagnet 2", conductor 56, armature and baci; Contact oi' magnet 27, free pole of battery. The stepping magnet 28 or sucli finder maires and breaks its own circuit, time stepping the Vbrush 21 ar und tion 2, inr which position magnets 28, 22 areV maintained energized over tlie following circuit: 'free noie of battery, armature and baclr contact of magnet 27, conductor 5G, magnets 28 and 22, arm 1, conductor 30,'conductor 2&5, armature and baclr contact or relay 24a, conductor 243, relay 242, conductor 2&1, lett armature and back contact of relay 2&0, conductors 239, 238, armature and front contact ot relay 210, conductor 237, relay 236, conductor 235, lett armature and back contact of relay 234, conductor 233, armature and 'front contact ot relay 313, conductor 250, relay 232, conductor Y 231, left armature and baclr contact or@ relay 230, conductor 229, conductor 58 (Fig. 1), arm 3 and its 3rd contact, conductor 29, conductor 54, armature and back contact of magnet 28, conductor 53,'conductor 30, conductor 226 (Fig. 2), armature and back con' tact of relay 225, conductor l2211, relay 223,

ri o

vlongfs .tol ltheliiie :finder 'Ilormitlly'lserying lines, other 'fealls 'fromfthis groupV Cnn'otbe l attracting its lett `rImttUre; removesgronnd y from'Conductor,y '311, "from which' 'oondneto'r relays 313,1 205 of'*subgroups**normallyserye'd by operatori No. 3 are lriclgecl. "Conse- Aquently7 these `relays 4in `tetra''ating their f 300,20?, feQntnetsf42,f43-efthefopemters the opening 'of leontarets 42,43 'o'tthelistnenerg'zs relays-205,313, "etefftlyms restoring the normal 'Connect-10111015 the start-nig elreult with "these n:finclers 'so chate `vsubseqlrentz n- 1 coming' 'Call' *can "strt tliepreselee'tedolie in r f motion.

A, pilot remy 320 te provi-'eed teaptedf to `-be Venexgifxecl Wlren lthe relays'3318,y lflcyete., are simultaneously energized. :This relay l/Vliat is claimed is:

1. ln a telephone exchange system, the combination with telephone lines diyided into groups, a group of connecting circuits for each ot said line groups, operators positions among which said connecting circuits are distributed in such a manner that some ot the connecting circuits serving each line group appear at each position, means for automatically associating said connect-y ing circuits with calling lines upon the initiation of calls therein, and means for rendering all said positions except one artificially busy and for concentrating calls on the connecting circuits ot such position, ot means operating automatically when the connecting circuits of a given group at such position become busy for removing the artificial busy condition of the connecting circuits at an adjacent position.

2. ln a telephone exchange system, the combination VWith telephone lines divided into groups, a group of connecting circuits for each of said line groups, operators positions among Whichy said connectingcircuits a're distributed in such a manner that someot' the connecting circuits serving each line group appear at each position, means for automatically associating said connecting circuits with calling lines upon the initiation ot' calls therein, and means for rendering said positions artificially busy and for concentrating calls trom said line groups on the connecting circuits of a particular po sition, of means operating automatically when the connecting circuits of a given group at such position become busy for removing the artificial busy condition of the connecting circuits at an adjacent position,

and means operating automatically when the connecting circuits of such group at such adjacent position become busy for remoring the artilicial busy condition ot the other adjacent position.

3. ln a telephone exchange system, the combination with telephone lines, connecting circuits terminating in automatic finder switches to which said lines are multipled in groups, operators positions among which said connecting circuits are distributed-in such a manner that some ot the connecting circuits serving each group appear at each position, means for causing one ot said finders to connectwith a calling line upon the initiation of a call therein, means for yrendering said positions artilicially busy and for concentrating all calls on the connecting circuits of a particular position, and means operating automatically when the connecting circuits of a given line group at such' position become busy for removing the artiticial busy condition of the finders at an adjacent position.

t. ln a telephone exchange system, the combination with telephone lines, connect- 'infra/lss ing automatically when the connecting cir-V cuits of a given group at such position become busy l-or removing the articial busy condition of the iindcrs at anadjacent position, and means operating automatically when the connecting circuits of such group at such adjacent position become busy for remoying the artificial busy condition of `the other adjacent position.

5. ln a telephone exchange system, the combination with telephone lines, connecting circuits terminating in automatic finder switches to which said lines are multipled in groups, side switches vcontrolling said linders, operators positions among which said connecting circuits are distributed vin such a manner that some of the connecting circuits servingeach group appear ateach position, means for causing one of said nders to connect with a calling line upon the initiation ot a call therein, means tor rendering said positions artificially busy and for concentrating all incoming calls on the connecting circuits et a particular position, and a circuit adapted to be closed when the side switches ot the finders of a given group at such position are oil' normal for removing the artificial busy condition vof the finders` at an adjacent position.

6. ln a telephone exchange system, the

combination Twith telephone lines, connecting y ts terniinatingV yin automatic tinder s ches to which said lines are multipled in groups, operators positions among which 'said connectinol circuits are distributed in such a manner that some of the connecting circuits servingveach groupv appear at each position, means lor causing one of said linders to connect vWith 'a calling line upon the initiation ot a call therein, and means for concentrating all incoming calls on the linders ot a particular position.

7. lny a telephone exchange system, the combination with telephone lines, connecting circuits terminating in automatic finder switches to which said lines are multipled in groups,-operators positions among which said connecting circuits are distributed in such a manner that some of the connecting circuits serving each group appear at each position, a starter Wire adapted to preselect an idle iinder, and means for changing the normal relation of said starter Wire to said combination with telephone'lines dividedl into groups, each ot said 'groups ybeing divided into subgroups, automatic `iinder switches to which said lines are multipled, there being vprovided as many finders for each group as there are subgroups therein, and each subgroup having a finderr apportionedltheretofivith a set of brushes in operative relation to multiples thereof, arelay (Q00, Q71) for, each subgroup, a starter Wire controlled thereby, and normally associated with the nder apportioned thereto. 'asecond relay (205, for' eachsubgroup, groups of connecting circuits for said line groups adapted to be associated with said lines by said nders, operators positions including a night position, said connecting circuits being distributed among said positions in such a manner that some of the connecting circuits serving each group appear at each position, means including manual switches at said positions for operating said relays (205, 813) to transfer the starter Wires from operative relation to their associated finders and into operative relation with an idle connecting circuit at said night position.

9. In a telephone exchange system, the combination with telephone lines divided into groups, each of said groups being 4divided into subgroups, automatic finder switches to which said lines are multipled, there being provided as many finders for each group as there are subgroups therein,

Aand each subgroup having a finder apportioned thereto with a set of brushes in operative relation to multiples thereof, a relay (900, Q71) for each subgroup, a starter wire controlled thereby and normally associated With the finder apportioned thereto, a second relay (Q05. 313) for each subgroup, groups of connecting circuits for said line groups adapted to be associated with said lines by said finders, operators positions including a night position, said connecting circuits being distributed among said positions in such a manner that some of the connecting circuits serving each group appear at each position, a head-set at each position, a pliw and jack by means of which said set is i placed in operative relation to the connecting circuits of its position. means operated by thc withdrawal of said plugs for operating said relays (205, to transfer the starter Wires from operative rela tion to their associated iinders and into operative relation with an idle connecting circuit at said night position.

lO. ln an automatic telephone exchange system wherein the calling lines are divided into groups, the groups terminating in difierentscctitms of a rou7 of terminals nmltipled so as to be accessible toa number of brush carriers, the combination withal carrier for `each roiv,^driving meansjfor said carriers, multiply connected brushes mounted on said carriers one for each section oit terminals, kmeans associated with saidcarriers and'so constructed and arranged that upon the simultaneous initiation 'of ycalls in severalof said groups, brushes, each'serving a different section will lbe vsimultaneo'usly drivenaover such sections by said driving means in search of the callingV lines, a connecting circuit associatedwvith each carrier, operators7 positions'among Which said connecting circuits are distributed in such a. manner that some oi" the connecting circuits serving each group appear at each position, means for automatically rendering the position to which an actuated carrier belongs artiiicially busy, and manual means controlled by the operator in answering a. call for removing such artificial busy condition.

1l. In a telephone exchange system Wherein calling lines are divided into groups and terminate in a row multipled across the face of a. panel, the combination With a carrier for each row, multiply connected brushes mounted spirally upon each carrier one for each group of terminals, the carriers being so arranged that each group oi lines has a brush normally in operative relation to multiples thereof, means tor moving said` carriers independently upon the initiation of calls in said groups, a connecting circuit associated with each carrier, operators positions among which said connecting circuits are distributed in such a manner that some of the connecting circuits serving each group appear at each position, means for causing one ot said finders to connect with a calling line upon the initiation of a call therein, means for thereupon automatically rendering the position to which said carrier belongs artificially busy, and manual means cont-rolled by the operator in answering a call tor removing such artificial busy condition.

12. In a telephone exchange system, the combination with telephone lines divided into groups, a group of connecting circuits for each of said line groups, operators positions among which said connecting circuits are distributed in such a. manner that some of the connecting circuits serving each line group appear at each position, means for automatically associating said connecting circuits With calling lines upon the initiation of calls therein, and means Yfor rendering certain of said positions artiiicially busy and tor concentrating calls from a plurality of line groups upon the connecting circuits ot a particular position, ot' means operating automatically when a given number of the connecting circuits of a given line group at such position become busy for removing` the artificial busy condition of the connecting circuitsat an adjacent position.

13. In a telephone exchange system, the combination With telephone lines divided into groups, a group of connecting circuits for each of said line groups, operators positions, among which said connecting circuits are distributed in such a manner that some of the connecting circuits serving each line group appear at each position, automatic switch for associating said connecting circuits with calling lines upon the initiation of calls therein, a starter Wire, relays (265, 3.13) for controlling the saine, means includ` Copies of this patent may be obtained for ing a manual switch at each position for operating the relays (205, 313) thereof to transfer the starter Wire from operative relation to the automatic switches of such position and into operative relation With an idle connecting circuit of another position,

i a relay (318) operated upon the initiation CHARLES L. GO GDR-UM.

five cents each, by addressing the Commissioner of Patents, Washingon, D. C. 

